Mold



Aug. 2, 1927. 1,637,613

C. E. JOHNSON MOLD 490riginal Filed Nov. 4, 1925 2 Sheets-Sheet 1 INI/E/V/TOZ? CARL E. JOHNS UN 5 V paw/w ATTOQ JA Y;

Aug, 2 1927.

C. E. JOHNSON MOLD CARL E. (/0 NSO/V 2 Sheets-Sheet 2 Original Filed Nov. 4, 1925 Patented Aug. 2, 1927.

UNITED STATES PATENT OFFICE.

CARL E. JOHNSON, LOS ANGELES, CALIFORNIA, ASSIGNOB TO UNITEDBTTES ELECTRICAL MANUFACTURING COMPANY, 0] LOS ANGELES, CALIFORNIA, COB- HOLD.

POBATION OF CALIFORNIA.

Drlginal application filed. November 4, 1925, Serial 1T0. 66,879. Divided and September 15, 1826.

This invention relates to molds and articularly to a mold for casting rotors o induction motors.

This application is a division of my application entitled Flanged rotor, Serial No. 66,879, filed November 4, 1925.

In the application referred to, I disclo a novel form of a rotor in which the squirrelcage windings thereof are cast in such a manner as to provide a drive member for the rotor in which the laminations are embedded.

It is the general object of this invention to provide a mold for casting the squirrelcage of the rotor of the character mentioned above.

Another object of the invention is to provide a mold of this character, in which the laminations are clamped rigidly together when the metal is being poured.

It is a further object of the invention to provide a mold of this character in'whic-h the parts may be readily separated after the rotor has been cast and so that the rotor may be readily removed from the mold.

Other objects and salient advantages of tle invention will be made evident hereina ter.

Referring to the drawings in which I illustrate my invention,

Fig. 1 is ,a vertical cross-section taken through a mold embodying the features of the invention.

Fig. 2 is a horizontal cross-section taken on the line 2-2 of Fig. 1.

1, but showing the manner in which the parts of the mold may be separated.

Fig. 4 is a section taken on the line 4--'4 of Flg. 3.

Fig. 5 is a plan view of Fig. 3 taken as indicated by the arrow 5 of Fig. 3.

Fig. 6 is a sectional perspective view showing the rotor of my invention immediately after it has been removed from the mold and previous to the machining thereof.

Fig. 7 is a vertical section through the rotor-of my invention after it has been me. chined.

Before describing the details of the mold of the invention I will briefl describe the rotor which is produced there y.

Referring to Fig. 7, the rotor comprise! Fig. 3 is a vertical section similar to Fig.

this application filed Serial No. 185,672.

a member 11 and a magnetic body 12 which is embedded in and supported by the drive member 11. The magnetic body 12 is'composed of rin -shaped laminations which are laced toget er as shown. The drive memr comprises conductor bars" which extend parallel to the axis of the rotor and in circular arrangement therearound, rings 16 which are arranged at the opposite ends of the magnetic body 12, a cylindrical wall 18 which extends inside the magnetic body .12, a cylindrical extension 19 which extends upward from the upper end ring 16 of the cylindrical wall, 18, and an annular flange 20 which extends inward from the upper part of the cylindrical extension 19. The drive member 11 is machined so as to provide accurate faces, namely, the annular shoulder 23 and a cylindrical face 24 provided by the cylindrical wall 18. y Y

Referring to Figs. 1 to 5' inclusive, the

mold of this invention has a body31 having an inner cylindrical wall 32, a lower annular face 33 provided by an annular flange 33 extending inward from the cylindrical wall 32 of the body 31, andan annular bevel face 34 situated between the cylindrical wall 32. and. the annular face 33, all of which cooperate to provide a lamination chamber 36. The laminations 37 which form the magnetic body-12 are placed in the chamber 36 so that the lower lamination enga es a shoulder 38 of the body 31. This shou der 38 is annular and quite narrow, being formed between the cylindrical wall 32 and the bevel face 34. has a cup portion 41 which extends within the annular laminations 37. The outer face'of the cup portion 41 is tapered so as to provide clearance in order that the parts may be pulled. An annular shoulder 42 core 40 A head 48 of the mandrel 49 rests in a cavity 50 of the core 40 and engages a face 51 formed at the upper part of the cup lamination chamber 36 above the laminations 37. Cap clamp buttons 56 extend froma lower face 57 of the cap 55, these cap buttons 56 having faces 58 which contact an upper lamination 37. Legs 60 of a yoke 61 engage an upper .face 62 of the ca 55. A cross bar portion 63 of the yo e 61 has an opening 64; through which an upper threaded end 65 of the mandrel 49 extends. A nut 66 is threaded on the upper end 65 of the mandrel 49 which forces a washer 67 against the bar portion 63 of the yoke 61.. When the nut 66 is clamped in place, the core 10 is pulltd upward and the cap 55 is forced downward in such a manner that the core clamp buttons 45 and the cap clam buttons 56 0 amp the laminations 37. tig tly. The core 40 cannot be ulled upward beyond a certain position y reason of the engagement of "the faces 42 and 43.

Metal is poured into the mold through a central opening 68 of the cap 55, this metal flowing in all the spaces of the mold as shown clearly in Figs. 1 and 3. The open-v ing 68 is tapered so that the cap 55 may bepulled. Risers 69 in the form of semicylindrical channels are provided in the cap 55 for the escape of gases in order to eliminate blow-holes in the casting.

After the drive member of the rotor has been properly cast it is removed from the mold. "With reference to Fig. 3, as the nut 66, the washer 67 and the yoke 61 have been removed from the mold, the mandrel .49' is partially rotated so that the slots 70 (Fig. 4) formed in the head 48, disalign with lugs 71 formed in the lower part of the cavity 50 of the cup 1-1, these slots and lugs being aligned when the mandrel is inserted in place. A lower face 73 of the head 48 engages upper faces 74 of the lugs 71. The mandrel 49 is then forced downward and the core 40 isthereby removed from place. The manner in which the core 40 is removed is clearly shown in Fig 3. After the core and mandrel have been removed from the body 31, the rotor and cap are readily removed from place. 7 v

In Fig.6,- 1 show the rotor after it has been removed from the mold and before it has been machined. It should be noted that the end rings 16 have a series of 0 enings 76 which are made by the clamp uttonse5 and 56, andriser bars 77 extend upward from the upper end ring 16, owing to the fact that metal flows into the riser openings 69 when it is poured into the mold. The rough rotor is placed in a lathe or other it has been machined, has the appearance as shown in Fig. 7;

said lamination chamber above said lamina- .tions; cap buttonsformed on said cap,

rea ers suit-able machine so that the periphery '78 of the magnetic body 12 is concentric with the axis of rotation. The various faces of the rotor are then all machined to correct size and so that they are true. It is obvious that all of the faces may be made true, all of the cylindrical faces being absolutely concentric with the periphery 78 of the magnetic body 12. The rotor, after From the foregoing description it will be seen that the mold of my invention provides a very strong rotor. Rigidity is had because of thefact that all of the laminations 37 are securely clamped together while the metal is being poured. A very important feature of the invention, as previously pointed out, is the fact that the parts of the mold may be readily dismantled so that $5 the rotor may be easily removed from the 'moldafter the drive member 11 has been cast.

I claim as my invention:

1. A mold comprising: a body adapted to receive laminations; a core adapted to extend inside said laminations, having means for engaging a lower lamination; a cap adapted for insertion into said body, having means for engaging an upperlamination; and means for clampingsaid cap and said core in a manner to compress said laminations.

2. A mold comprising: a body having a lamination chamber adapted to receive laminatlons; a core having a. cup ortion adapted to extend inside said laminations; core buttons formed on said core, being positioned to engage a lower lamination; a cap adapted to be inserted into the portion of 106 bein adapted to engage an upper lamination; and means for clamping said core and said. cap together, said core and cap buttons clamping 216 said laminations.

3. A mold comprising: a body having a lamination chamber adapted to receive laminations; a core having a cup portion ada ted to extend inside said laminations; core uttons formed on said core, being positioned to engage a lower lamination; a cap adapted to be inserted into the portign of saidlamination chamber above said laminations; cap

' buttons formed on said -cap, being adapted 120.

to engage an upper laminat on; means for clamping said core and said cap together, said core and cap buttons clamping said laminations; and means for removing said core from lace. I

4. A mo d comprising: a body having a lamination chamber adapted to receive laminations; a core having a cup portion adapted to extend inside said laminations; core buttons formed .on said core, being positioned 130 to engage a lower lamination; a cap adapted to be inserted into the portion of said lamination chamber above said laminations; cap buttons formed on said cap, being-adapted to engage an upper lamination; a mandrel extending through said core, having a head restin in said cup; a yoke engaging said cap, tirough' which said mandrel extends; and means for causing said mandrel and said core to clamp said core and said cap 'togather, said core and cap buttonsclamping said laminations.

5. A mold comprising: a body having a lamination chamber adapted to receive laminations; a core having a cup portion adapted to extend inside said laminations; core buttons formed on said core, being positioned to engage a lower lamination; a cap adapted to be inserted into the ortion of said lamination chamber above said laminations; cap buttons formed on said cap, being adapted to engage an upper lamination; a mandrel extending through said core, having a head resting in said cup; a yoke engaging said cap, through which said mandrel extends; means for causing said mandrel and said core to clamp said core and said cap together, said core and cap buttons clamping said laminations; and means for removing said corefrom place.

6. A mold comprising: a body having a lamination chamber adapted to receive laminations; a core having a cup portion ada ted to extend inside said laminations; core uttons formed on said core, being positioned to I engage a lower lamination a cap adapted to be inserted into the portion of said lamination chamber above said laminations; cap buttons formed on said cap, being adapted to engage an upper lamination;-a mandrel extending through said core, havin a head resting in said on a yoke engagmg said cap, through whic said mandrel extends; means for causin said mandrel and said core to clamp 'said core and said cap tomeans for engaging an upper lamination;

and means for clamping said cap and said core in a manner to compress said lamlnations, said clamping means being operable after said cap is inserted in said dy.

8. A mold comprising: a body adapted to receive laminations; a core adapted to extend inside said laminations, having means for engaging a lower lamination; a cap adapted for insertion into said body, having means for engaging an upper lamination; and means for clamping said cap and said core in a manner to compress said laminations, said cap and said code being spaced a distance from said laminations.

9. A mold comprising: a body adapted to receive laminations; a core having a on portion adapted to extend inside said laminations, having means for engaging a lower lamination; a cap adapted for insertion into said body, having means for, engaging an upper lamination; means for clamping said cap and said core in a manner to compress said laminations; and means in said cup portion .for removing said core from place.

10. A mold comprising: a body adapted to receive laminations; a core adapted to extend inside said laminations, having means for engaging a lower lamination, said core 7 cooperating with said body to form a cavity for receivin the material oured; a cap adapted for insertion into said body, having means for engaging an upper lamination; and means for c amping said cap and said core in a manner to compress said laminations. i

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 10 day of Sept, 1926.

CARL E. JOHNSON 

